Frederick w



(No Model.)

- P. W. HOEFBR.

, D0011 SPRING. No. 409,587. Patented Aug. 20, 1889.

yucca/mg Z V gw'vitt-oz UNITED STATES PATENT OFFICE,

FREDERICK V. HOEFER, OF FREEPORT, ILLINOIS, ASSIGNOR TO THE VAR- NER MANUFACTURING COMPANY, OF SAME PLACE.

DOOR-SPRING.

SPECIFICATION forming part of Letters Patent No. 409,587, dated August 20, 1889.

Application filed May '7, 1889. Serial No. 309,876. (No model.)

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Be itknown that I, FREDERICK WV. IIOEFER, then crossed, winding all the coils and creata resident of Freeport, in the county of Steing a sufficient torsional strain to hold a door phenson and State of Illinois, have invented closed with some firmness. The end of one 5 certain new and usefulImprovements in Doorarm-loop is a little broader than that of the Springs; and I do hereby declare the followother, and in crossing the arms this end is ing to be a full, clear, and exact description of passed between the two parts of the opposite the invention, such as will enable others arm, the parts being slightly sprung apart for skilled in the art to which it pertains to make the purpose, and the middle parts M of the IO and use the same. branches of this Wider loop are bent some- My invention relates to improvements in what sharply inward, as shown, so that in the door-springs of the class in which the action working of the spring the arms may not inis reversed as the door, in its opening, passes terfere. At the same time the shoulders a certain point, so that when the door is forced formed by the bending prevent the uncrossr 5 open beyond a certain point it is held open ing of the arms by the action of the spring by the same spring that normally tends to alone, so that the spring does not require close it. tying for shipment, but is at all times in p0- In the accompanying drawings, Figure 1 sition for attachment to the hooks C by a shows the spring from above in operative poslight further crossing to bring the arms into 2o sition upon a closed door. Fig. 2 is a similar the position shown in Fig. 1. The length of view, the door being opened one hundred and the arms and the distances of the hooks from eighty degrees. Fig. 3 is a section on the line the hinge-axis are so proportioned that when w 00, looking toward the spring-coils. Fig. 4c the door is opened one hundred and eighty shows the spring seen in the direction of the degrees the arms may be, as shown in Fig. 2, 25 arrow of Fig. 1. Fig. 5 is a like view of a nearly parallel, respectively, to the door and modified form. Fig. 6 is a section on the line the jamb. In passing to this position the ends y y, Fig. 5, looking to the left. of the loops turn in the hooks C and the coils In the drawings, A and B are respectively swing bodily through an angle somewhat less a part ofa door and of a jamb or casing to than that passed through by the door, and 0 which it is hinged. Upon each of these is the line of strain, which is a straight line befixed a hook C, to be engaged by the arms of tween the hooks, crosses the line of the hingethe spring, whichis compound and consists of axis, and the spring thereafter tends to open four coils I I, mounted upon the four free instead of to close the door. So far as the ends of two cores E E, which are united at action of this spring upon the door is con- 5 the middle by an integrally-formed web F. cerned it presents little novelty; but the use Each of the four coils is wound oppositely to of two sets of coils halves the'torsional strain the coils either laterally or vertically adjaupon each; the upper branches and the lower cent, and each pair of coils upon the same core branches of the arms being respectively in is formed from the ends of single wire, the unthe same plane, they may be made to auto- 0 4o coiled middle portion of which is bent into a matically retain their crossed position; the loop, whose end engages one of the hooks C, ends of the arms being closed loops, they can and whose sides or branches M M are the not slip out of the fastening upon the door spring-arms. Each end spiral of each coil is and jamb; no mistake can be made in putting supported by an enlargement ll upon the the spring upon the door, and shorter pieces 45 core, and the free ends of all the coils are of wire being required the whole can be made bent inward into engagement with lateral from the waste wire accumulating in the slots G in the cores. The four coils are first manufacture of the other similar springs havformed and then slipped over the ends of the ing but one core. cores, their inwardly-bent ends passing along As shown in Figs. 5 and 6, the lower parts of 1o: 50 the grooves G until they reach the position the two cores may be omitted, the lower coils shown in the drawings. The two arms, at being replaced by hooks J, which engage the cores between the web F and the lower ends of the upper coils. In this case the force of the springs is exerted entirely through the upper branches of the arms; but in other respects the action of the spring is the same.

Instead of the lower ends of the coils being bent into the grooves G of the cores, the coils may be formed integrally, as shown, the lower turn of each spiral being continuous at O, which causes the reaction of the springs against each other without the transmission of the strain through the web, and, indeed,

when the coils are thus connected, the spring I is operative even if the cores be removed.

What I claim is 1. In a door-spring, the combination, with two rigidly-connected parallel spring-cores lying side by side, of oppositely-coiled springs mounted thereon and provided with opposing arms adapted to engage, respectively, suitable fastenings upon adoor and its jamb, substantially as set forth. Y

2. In a door-spring, the combination, with two parallel spring-cores rigidly united at the middle, of oppositely-coiled springs mounted thereon, each with one end in engagement with its core and each havingit-s opposite end carried outward to form an arm and returned upon itself and engaged with one of said cores, substantially as and for the purpose set forth.

3. The combination, with the cores E E, united by a web F, of springs I I, mounted thereon, the looped spring-arm M, carried by the springs I, and the looped spring-arm M, carried by the springs I, andhaving the inwardly-bent branches passing between the branches of the arm M, substantially as set forth.

4. The combination, with the laterallyslotted cores rigidly connected by the web F, of the oppositely-wound springs II mounted upon the core E, with their adjacent ends in engagement with said core and with their outer ends extended to form asingle armloop, the similar springs I, mounted in like manner upon the core E, and having their outer ends extended to form a second opposing arm-loop h substantially as and for the purpose set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

FRE DE RICK IV. HOE FER.

\Vitnesses:

J. H. STEARNs, JACOB W. GIEB. 

